NAME

       Math::PlanePath::Base::NSEW -- multi-inheritance mixin for North, South, East, West unit
       steps

SYNOPSIS

        package Math::PlanePath::Foo;
        use Math::PlanePath;
        use Math::PlanePath::Base::NSEW;
        @ISA = ('Math::PlanePath::Base::NSEW', 'Math::PlanePath');

DESCRIPTION

       This is a multi-inheritance mixin for paths which take only steps North, South, East and
       West by distance 1 each time.  This includes for example the "SquareSpiral" and also
       things like the "DragonCurve" or "CCurve".

       The following path descriptive methods are provided

                               value
           dx_minimum()         -1
           dx_maximum()          1
           dy_minimum()         -1
           dy_maximum()          1

           dsumxy_minimum()     -1
           dsumxy_maximum()      1
           ddiffxy_minimum()    -1
           ddiffxy_maximum()     1
           dir_maximum_dxdy()   0,-1    # maximum South

SEE ALSO

       Math::PlanePath, Math::PlanePath::Base::Generic

HOME PAGE

       <http://user42.tuxfamily.org/math-planepath/index.html>

LICENSE

       Copyright 2014, 2015 Kevin Ryde

       This file is part of Math-PlanePath.

       Math-PlanePath is free software; you can redistribute it and/or modify it under the terms
       of the GNU General Public License as published by the Free Software Foundation; either
       version 3, or (at your option) any later version.

       Math-PlanePath is distributed in the hope that it will be useful, but WITHOUT ANY
       WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with Math-
       PlanePath.  If not, see <http://www.gnu.org/licenses/>.